【摘要】 在铁路信号电缆高阻接地故障定位的研究中,由于外界因素的影响,多线路随机性较强。为此提出了一种基于折算相位差的定位方法。通过将两路频率成倍频关系的正弦信号注入故障电缆的阻容网络,测量故障电缆里的电流并按照推导出的折算相位差公式定位故障的位置。定位的难点在于电流信号相位的计算,DFT变换可以求得信号的相位,但它是以矩形窗的方式截取信号序列的,频谱泄露大,而以Hanning Window的方式截取信号序列有效的克服了这一点,再通过重心法对信号的频谱进行校正,极大地提高了电流信号相位的精度。在Matlab的Simulink中搭建故障电缆阻容网络仿真模型,用改进的算法处理所测信号,仿真的结果证明改进算法在定位电缆接地故障上的可行性。更多还原

【Abstract】 A new method using conversion phase difference for soft cable fault location is presented. The new method locates the fault by measuring the current signal in a RC network based on a new signal processing algorithm of conversion phase difference. The dual sinusoidal signal is the incident signal for the RC network built by faulty cables,and one signal’s frequency is N times that of the other. The difficulty of location is to calculate the current signal phase. This paper uses hanning window method to processe signal sequence instead of using boxcar window method,and it reduces spectral leakage. And then the gravity laws are used to verify spectrum signal,which improves the phase accuracy of the measured signal. The performance of this method is verified through tests by building the RC network model in Matlab. The simulation results show that the new signal processing algorithm is able to locate cable fault effectively.更多还原